MISUMI has a new partnership with A&D Weighing, a global leader in weighing equipment and systems, and they shared with us some critical tips for setting up your balance for maximum precision.
Measuring weight with accuracy and precision remains one of the most critical components in almost every business. Despite booming technology advances in scale hardware and supporting software, having the right equipment is only a part of the equation – knowing how to weigh properly involves two key components, which work to mitigate the external influences and user errors that can be detrimental to precise weighing:
- Choosing the right balance location
- Proper balance operation
Location, Location, Location
To ensure precise weighing results, consider the following tips on balance placement:
1 – Environment
The room should be vibration-free, free from drafts and electrostatic charges, and should maintain a constant temperature (weighing results vary widely when exposed to significant changes in room temperature – so maintain distance from fixtures such as windows or refrigerator).
2 – Weighing Counter/Benchtop
The weighing bench should be sturdy and stable.
3 – Light
Direct sunlight and lighting fixtures can influence weighing results through heat radiation, so the balance should be placed at a significant distance from both (fluorescent tube lights work best).
4 – Atmospheric Humidity
Experts recommend the relative humidity should be between 45 and 60% and should not be operated above or below 20 – 80%.
Operation: Mission Precision
To ensure balances can measure highest precision, using the following:
The balance should always be connected to its power supply, so it can be left in standby mode perpetually.
The balance is leveled prior to any weighing, so check the level indicator before each use, adjusting the leveling feet if needed.
Check the calibration of the balance on a regular basis, using the following as a general guide:
- When operated for the first time
- When the location is changed
- After leveling
- After any changes in temperature, humidity, or air pressure
The weighing vessel should be placed in the middle of the weighing pan, to prevent corner load errors.
Zero & Taring
It’s important to “zero” the balance regularly to ensure accurate weight before you place anything on the balance. When weighing with a container always use “tare”. The balance will store the “container weight” and visually display to zero. That way, only the net weight of the sample will be measured and the weighing container will be subtracted out. If the weighing pan has debris or another container present, the balance would only record the gross weight.
The smallest possible weighing vessel should be used, avoiding materials with a high degree of electrical insulation, such as glass and plastic, which can become electrostatically charged. The temperature of the weighing vessel and the sample it contains should be the same as in the lab room (as a result, human hands should not handle the vessel or sample, and following removal from a drying oven or dishwasher, it should acclimatize to lab room temperature).
The weighing chamber and weighing pan should be clean at all times, using conventional window-cleaning fluid and a lint-free cloth.
Thank you to A&D for this great resource on weighing tips. You can explore all of A&D Weighing’s products including lab balances, load cells, viscometers, industry scales and more at this link. Happy Weighing!